Experimental study of three-dimensional trajectory and dynamic characteristics of rising bubbles

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2024-11-26 DOI:10.1016/j.pnucene.2024.105537

Longxiang Zhu , Li Liu , Luteng Zhang , Qiang Lian , Simiao Tang , Zaiyong Ma , Wan Sun , Liangming Pan

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Abstract

Understanding the bubble motion characteristics in the two-phase flow is crucial for mass, momentum, and heat transfer processes between gas and liquid phases in various engineering systems. Despite decades of studying the phenomenon of bubbles rising in quiescent water, there is no unified conclusion regarding the three-dimensional motion characteristics of bubbles larger than 3 mm, where bubbles exhibit zigzag or spiral trajectories with shape oscillations. Meanwhile, the zigzag and spiral motions are sustained by the induced additional lift caused by the wake vortices acting on the bubbles, however, the evolution of forces acting on the bubbles during the stable rising phase has not been further studied by considering the combined effects of forces. This paper presents experimental research on the three-dimensional motion characteristics of bubbles during the stable rising phase. The results show that the bubbles transition from ellipsoidal shape to irregular shapes as the diameter increases, and the trajectory of the bubbles changes from regular spiral motion to random motion coupled with straight lines, zigzags, and spiral. The motion of bubbles during the stable rising phase is influenced by the combined effects of buoyancy, drag, and induced lift by the wake vortex. Additionally, the aspect ratio and terminal velocity of the bubbles were investigated using empirical relationships and dimensionless numbers, Eotvos, Weber, and Tadaki number. It was found that using the Tadaki number to predict the aspect ratio yielded the most accurate results, with the experimental values well predicted by an empirical correlation.

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上升气泡的三维轨迹和动态特性的实验研究

了解两相流中气泡的运动特性对于各种工程系统中气相和液相之间的质量、动量和热量传递过程至关重要。尽管对静止水中气泡的上升现象进行了几十年的研究，但对于大于 3 毫米的气泡的三维运动特性仍没有统一的结论。同时，人字形和螺旋形运动是由作用在气泡上的尾流漩涡所引起的附加升力来维持的，但在稳定上升阶段，作用在气泡上的力的演变还没有通过考虑力的综合效应来进一步研究。本文对稳定上升阶段气泡的三维运动特性进行了实验研究。结果表明，随着直径的增大，气泡从椭圆形过渡到不规则形状，气泡的运动轨迹也从规则的螺旋运动变为直线、之字形和螺旋相结合的随机运动。气泡在稳定上升阶段的运动受到浮力、阻力和尾流漩涡诱导升力的综合影响。此外，还利用经验关系和无量纲数 Eotvos、Weber 和 Tadaki 数研究了气泡的长宽比和末端速度。结果发现，使用 Tadaki 数预测长宽比得出的结果最为准确，实验值也能很好地通过经验相关性进行预测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.